A) \[Zn\]
B) Cobalt
C) Chromium
D) \[Fe\]
Correct Answer: B
Solution :
\[CoO\ +\ {{B}_{2}}{{O}_{3}}\ \xrightarrow{\text{Heat}}\ \underset{\text{Copper metabrate (blue)}}{\mathop{Co{{(B{{O}_{2}})}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,\]
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